Peanut Butter Mixer



•  Motor Cube
•  Battery Cube
•  LED Cube
•  Short wires (2)
•  4 x8 plate (2)
•  Wheels (4)
•  Axles (2)
•  24-tooth gear
• 16-stud beam (2)
•  Peanut butter jar


Tenka Labs


This ingenious project lets you roll a jar of “natural” peanut butter around so that the oil gets mixed in. This is much easier than doing it with a spoon. (Don’t worry, you can still get a spoon for licking!) We also like to use it as a rock tumbler. What else could you do with it?


1  Gather your Cubes and other materials.

2  Collect the building bricks, 13 in all.

3  Snap the Motor Cube together with the Battery Cube, being careful to align the metal poles, and place the
4 x 8 plate on top of them.

4  Place the long brick on top of the 4 x 8 plate.

5  Build a small support piece using these three brick pieces.

6  Take the support piece and connect it to the other parts.

7  The two flat blue plates will be touching.

8  Assemble the two axles. One will need to have a 24-tooth gear on it.

9  Space the wheels out.

10  Mount the axles into the long brick, being sure to align the Motor Cube with the large 24-tooth gear on the axle. Attach the second 16-stud beam onto the opposite side so that the axles line up with the other holes.

11  Now that the frame is built, prepare to add the LED Cube.

12  Use the short wires to jump power from the Battery Cube to the LED Cube’s posts.

13  Double-check the connections to the LED Cube. It will only turn on if you connect the wires as shown.

14  Test everything by turning the Battery Cube switch on.
NOTE: The LED Cube should turn on and the Motor should spin and rotate the axle with the gear. The other set of wheels will not spin. If everything is working, add the jar of peanut butter that you want to mix.

15  Gently place the jar on top of the wheels and turn on the Battery Cube. The motor will turn the axle and the rubber wheels will rub against the jar and make it spin.

NOTE: Depending on the size of the jar, you may need to adjust the spacing in between the axles.